Ventilated midsole



Dec. 16, 1947. M, MARGQLlN 2,432,533

VENTILATED MIDSOLE Filed April 25, 1944 INVENTOR Patented Dec. 16, 1947UNITED STATES PATENT OFFICE VENTILATED MIDSOLE Meyer Margolin, Elgin,Ill.

Application April 25, 1944, Serial No. 532,588 i claim. (c1. 36-3) Myinvention relates to a novel midsole 'construction and more particularlymy invention relates to a resilient midsole, the resilient midsole beingof such form as to provide increased resilience, forced breathing and atthe same time being characterized by lightness of weight.

In my prior application Serial No. 257,351 and my prior Patents Nos.2,153,021, 2,207,632, 2,307,416, 2,327,360 and 2,347,207 of which lastpatent this is in part a continuation, I have set forth certainconstructions in which I secure a, resilient insert to an insole havingan opening, the insert carrying a lap which extends over and is securedto that portion of the insole which is adjacent the opening therein. Aspointed out in the above applications and patents, it is the purpose ofmy construction to provide for forced breathing effects within the shoe,e. g. it is desired that an air pumping action be provided by the insertor midsole construction so that air is forced into the foot area of theshoe. It is further desirable that the insert be such as to provideincreased resilience for the ball of the foot to provide for increasedcomfort.

I have found that weight is a factor of great importance in theseconstructions and according to the invention which I shall presentlydescribe, I have succeeded in obtaining the desirable results ofresilience, forced breathing effects and at the same time I haveachieved a lightness of weight hitherto unobtainable in inserts ormidsole having these characteristics.

According to the present invention I provide a midsole formed ofresilient material such as rubber, either in the form of expanded closedcell rubber or expanded open celled rubber or sponge rubber.

It is the object of my invention to provide a novel resilient midsolefor a shoe construction for increased foot comfort.

These and further objects of my present invention will become apparentfrom a consideration of the drawings taken in connection with thedescription which here follows.

Figure 1 is a top view of a middle sole of my invention, the middle solebeing broken away to show two different structural designs.

Figure 2 is a bottom View of the middle sole of my invention.

Figure 3 is a cross section along the line 3-3 of Figure l.

Figure 4 is a perspective of a small broken away section of the middlesole of my invention.

Figure 5 is a top view of a portion of a modified form of the middlesole of my invention.

Figure 6 is a bottom view of the middle sole shown in Figure 5.

In Figure l I show a middle sole generally denoted as 50 which comprisesa multiplicity of cavities 5I which have the Walls 52 and perforations53. The walls 52 of the respective cavities act as walls for adjacentcavities as will be noted from an examination of this drawing. By meansof this construction a middle sole of extreme lightness is obtainedwhich is characterized by increased resilience and increased forcedbreathing effects. This is because the flexing and compression of thewalls 52 is communicated to two cavities and at the same timecommunicated to adjacent walls causing flexing and compression of suchwalls and adjacent cavities.

In the lower part of the drawing which is broken away I show a modifiedstructural design in which the cavities 55 are staggered with respect toone another, the walls 56 and 51, however, still taking the form ofcommon walls for adjacent cavities.

In Figure 2 I show the reverse side of the middle sole shown inFigure 1. The structure will be more clearly apparent from aconsideration of Figure 3 in which I show the middle sole 50, positionedbetween an insole and the outsole 61, having perforations 66 to permitthe flow of air from the cavities 5l and. The middle sole 50 ispositioned between the inner sole 65 and the outsole 61. The relativeposition of the upper 68 in the shoe construction is illustrated. FromFigure 3 it will be apparent that upon the flexing of the middle soleduring the act of Walking, the respective cavities 5I and 60 will bealternately compressed and decompressed causing the ow of air therefromand the tension and stresses on the respective walls 52 and 6l of thecavities will be transmitted to adjacent walls and adjacent cavities.

In Figure 4 I show a section of the middle sole to more clearlyillustrate the structure thereof, and like numbers here correspond tolike numbers in Figures 1, 2, and 3.

In Figures 5 and 6 I show cavities 10 made up of hexagonal walls 'H andhaving perfcrations l2 located in such cavities to provide thecommunication of air from the cavities to the shoe interior.

r In the reverse side of the middle sole shown in Figure 6 I showcavities Tl having walls 'I8 and perforations or openings 'l2 extendingtherethrough.

According to the constructions here shown, therefore, I have set forthcertain middle sole constructions, characterized by extreme lightness inWeight and possessed of increased resilience and forced breathing effectfor foot comfort. A minimum of solid material is used with a maximum ofresilience and breathing spaces, and means are provided for causingtransmission of the stresses in the respective cavity walls throughoutthe shoe.

I claim:

A middle sole comprising a layer of resilient material, said layerhaving cavities on both sides, adjacent cavities having relatively thinWalls, said cavities being polygonal in shape, and of relatively smallwidth so as to present a supporting upper surface, said walls comprisingresilient material, and openings in said layer connecting cavities onone side of said middle sole to cavities on the opposite side of saidmiddle sole.

MEYER MARGOLIN.

REFERENCES CITED The following references are of record in the le ofthis patent:

Number D. 29,749 5 D.. 32,416 D. 29,554 55,247

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